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Diffstat (limited to 'doc/todo/threaded_runtime.mdwn')
| -rw-r--r-- | doc/todo/threaded_runtime.mdwn | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/doc/todo/threaded_runtime.mdwn b/doc/todo/threaded_runtime.mdwn new file mode 100644 index 000000000..095ffa435 --- /dev/null +++ b/doc/todo/threaded_runtime.mdwn @@ -0,0 +1,29 @@ +The [[design/assistant]] would be better if git-annex used ghc's threaded +runtime (`ghc -threaded`). + +Currently, whenever the assistant code runs some external command, all +threads are blocked waiting for it to finish. + +For transfers, the assistant works around this problem by forking separate +upload processes, and not waiting on them until it sees an indication that +they have finished the transfer. While this works, it's messy.. threaded +would be better. + +When pulling, pushing, and merging, the assistant runs external git +commands, and this does block all other threads. The threaded runtime would +really help here. + +--- + +Currently, git-annex seems unstable when built with the threaded runtime. +The test suite tends to hang when testing add. `git-annex` occasionally +hangs, apparently in a futex lock. This is not the assistant hanging, and +git-annex does not otherwise use threads, so this is surprising. --[[Joey]] + +--- + +It would be possible to not use the threaded runtime. Instead, we could +have a child process pool, with associated continuations to run after a +child process finishes. Then periodically do a nonblocking waitpid on each +process in the pool in turn (waiting for any child could break anything not +using the pool!). This is probably a last resort... |